Latch



(l lo ModeL) T. KIRWAN.

Latch.

'No. 236,895. v Patented Jan. 25,1881.

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N.PETEfiS. PNOTO-LITHDGRAMER, WASHmgTON. D O

UNITED STATES PATENT OFFICE.

THOMAS KIRWAN, OF BOSTON, MASSACHUSETTS.

LATCH SPECIFICATION formingpart of Letters Patent No. 236,895, dated January 25, 1881.

Application filed May 17, 1880. (No model.)

To all whom it may concern:

Be it known that I, THOMAS KIRWAN, of Boston, Massachusetts, have invented a new and useful Improvement in Latches, of which the following is a specification.

My invention relates to improvements on latches in which the bolt is released from the door-jamb by pushing the knob on one side or pulling it on the other; and my device consists of five parts-via, the box or casing A, bolt B, spindle O, with handles or knobs upon itateitherend, connecting-rod D, and spring E.

G represents the door, and H the doorjamb.

In the drawings, Figure 1 shows a plan with the top of the casing removed, and Fig. 2 a side view with the side of the casing removed.

The spring E rests between the front end of the bolt B and a stop; A, on the case A, and presses the bolt constantly forward, so that it will engage with the door-jamb in the usual manner.

The spindle passes through washers screwed to the door, as usual, and has upon its rear side a socket, a,i nto which one end of the rod D is inserted, the other end of the rod being inserted in a socket, a, in the rear end of the bolt B, and the rod D being wholly disconnected from the casing A.

When the spindle is moved inward or outward by the push or pull the connecting-rod D has a direct positive action with but little friction, moving tothe position shown by the dotted lines and drawing the bolt from the 3 5 jamb. The parts will return to their original positions through the action of the springwhen the knob is released.

I am aware that a sliding spindle has been combined with a bolt by means of a lever fulcrumed near its middle, (see Patent No. 71,474, of 1867,) and also by means of a lever fulcrumed at one end with a projection on the other end working in an inclined plane in the bolt. (See Patent No. 100,714, of 1870.)

The connecting-rod in my device is socketed at one end in the bolt and at the other end in the sliding spindle, and moves bodily to cause motion of the bolt, this rod not being connected with the casing, While in the other forms the motion of the connecting rod or lever around a fixed fulcrum is necessary to move the bolt, the fulcrum-pin connecting the rod or lever to the casing.

The construction is cheap and simple, and with a mortise-latch one hole bored and suit- 55 ably trimmed will serve for the insertion of the latch in the door. The connecting-rod is put in position through a slot in the door when the spindle is arranged.

What I claim as my invention is- In combination, the case A, spring-latch B E, sliding spindle O, and connecting-rod D, the connecting-rod D not being connected to case A, but socketed at one end in the sliding spindle O, and at the other end in the bolt D, 65 as set forth.

THOMAS KIRWAN. Witnesses:

CHAS. F. SLEEPER, D. RENSHAW. 

